Electron discharge device



Aug, 25, 1931 s. scoGNAMlLLo ET Al. 1,820,836

i ELEGTRON DISCHARGE DEVICE Original Filed June 25, 1928 2 Sheets-Sheet l llg- 25, 1931. s. scoGNAMlLLo ET Al. 1,8209335v I ELEcTRoN DIscHAnGE DEvIcE Original `=`iled June 25. 1928 2 Sheets-Sheet 2 nti-l1...

Patented Aug. 25, 1931 sALvAToREscoGNAMILLoAND PAUL ARNDT, or NEW YORK, N. Y.

ELECTRON DISCHARGE DEVICE Application filed June 25, 1928, Serial N,o288,172. Renewed July 3, 1931.

This invention'relates to improvements in electron discharge devices, one obJect of the invention being'the provision of a peculiar'v construction and mounting of the anode or .q' filament inconjunction with a heating cathode,-whereby the amount of current emanating fromthe anode and the eiiiciency in the discharge. of electrons is determinedr` by the surface 10 which, in the present instance, as is the case with the anode, has its operating surface man terially increased, the said lcathode acting as a permanent negative. f A further object oft-his invention is the pro- 15 vision 0f an electron discharge device of a type especially adaptedfor'power ampliiiea-l tion and whereby alternating current may be used for the lament or anode'. 4With the present construction, the detailed .12.0 arrangement .of the electron discharge device as particularly set forth and described in our co-pending application ytiled April 9, 1928, erial No.r 268,705, is employed, in conjunction with a novel arrangement and construci tion of anode and permanent negative cathode, thus providing ay means whereby the constructionshown in said pendingapplication' as adetector and amplifying tube may be used as a'poweramplifying tube. y In the accompanying drawings Figure 1 is a vertical central sectional view' through the Vpreferred form of vthe present electron discharge device Y 50'A Figure 8 is a view similar to Figure 1 of a capacity of the intermediate cathode Figure 2`is a.' section italien; on line 2 2 igure am perspegavevew 'ofthe plum enlarged detail. sectional" slightlymodified form of tion; Y

Figure 9 is a section ltaken on line 9-9 of Figure 8; Y

Figure 10 is ai detail'plan view of one'of the 55 meilnbcrs Aolf the grid of the present device; `i anc F igurell is a section taken on line 11-11 the present inventhereo'f. n f* l Referring to the dra-wings and more par- 6U ticularly tov Figures 1 to 7, inclusive, the numeral 12 designates the base of the evacuated tube 13. Mounted in the base and enclosed within the tube are two insulating supports 14s and 15 for the respective parallel por- 65 tions 16and 17 of the filament, the looped upper end of whichV is supported in an insulating member 18 which Yis made in the form of a yoke and is itself supported by a standard 19, the lower endv of which is carried by the 70. base 12. vThus the lament is dividedinto two heating elements 16 and 17 which are disposed in parallel relation to each other, the purpose of which willzpresently appear. y The cathode 2O comprises a pair of tubular 75 chambers 22Vand 23 connected by a pair of superposed plates 21 of thesame height as said tubular chambers. As shown, -each of the plates 21 isbent adjacent its vertical edges to form channels of substantially semicircu 83 lar `cross-section, and the plates are secured togetherby rivets with their channels in opposed relation toform thechambers'22 and 23.

A pair of sockets horizontalA edges of the rplates 21, as by dc-` pressionsv in the olposed'taces' of said plates, to receive the upper ends of a pair of supporting wires 25 and' 25', which, in turn, are supported from the hase 12. f I

' As clearly illustrated, th'e'heating elements 16 and" 17 of the iilament are disposed 'through and centrally of each of the chambers 22 and 23, which, in turn, are closed at their top by means of tubular caps 26, each one ofwhich Asurrounds its adjacent portion ot' the filaments 16 or17 and is composed of a heat-resisting insulating material. f

l Itwill thus be seen that by this arrangement the efficiency of the `present electron are'iormed' at the lower 8 discharge rdevice will be determined by the amount of current emanating from the filament, and the eficiencyin the discharge ofV the electrons is also determined by the surface capacity of the Vintermediate double z Y out=distortion or choking effect.

|The remaining construction of the present velectron discharge device is similar to that ous filaments? 'of shownin the co-pending application above mentioned Vand consists primarily of elongatedl open `members or plates 28 having apertures 29 for the reception of terminal and'supporting rods 30 and 30, while a surrounding shell 31 is properly supported by yrods or terminal supports 32 and 33 in the base 12.

The two 25 are connected to two plugs or pins while. the support 25 for the cathode 2D1is connected to a plugor pin 25a. The grid support' 30 is connected to a plug or pin G, while the plate support 33 is connected to a plate pin or plug P. Y

Thus,`with this type .of electron discharge filament-carrying supports 25 and F, F,

dev-ice, as inour previous construction, five pins, prongs or plugs are employed in installing the presentconstruction. In Figure 7 .an electrical diagram is shewn with the present electron discharge devices inv diagram vtherein and in which three of such discharge devices are installed, but the installation ofthe present tube is in no wise" limited to this particular circuit arrange-v ment, and the same isv only shown as o-ne eX- ample of obtainingA the/desired results in aV power' amplifying circ-uit with the present type of electron discharge device.

`YIn` thisz diagram, an alternating current step-down transformerT is employed to step down the alternating current voltage of, say, 1.10 volts to 5 volts, for delivery to the varidevices, while the respective plates and grids and .the4 cathodes 20` are connected to be affected by the direct current voltages, as illustrated. v.

Inthe constructionshown in Figures 8, 9,

l0 and 11, each element as rela-tes to the anode v and double cathode 20 is identical, the yonly diiference being that theY grid elements 28 are provided with'restricted portions 281' which conform more nearly to the exterior the three electron discharge identical, and the Vwiring beingv identical to the construction previously described.

From the foregoing description, taken in connection with the drawings, it is evident that with this peculiar arrangement and construction an alternating current power amplifying electron discharge device is produced and by means of which the surface capacity is increased, and, therefore, the efficiency,

without increasing the curi-ent consumption,

this electron discharge device consisting primarily of a concealed glow filament extending through two combined intermediate cath@ odes. Y What is claimed 'isz-4 Y 1. An electron discharge device, including a cathode comprising a pairof metallic plates each having a channel in one of its faces ad@l jacent each ofits ends andi securedtogether face-to-face with their channels disposed vopposite to one another andV forming a pair of parellel chambers, yand, a filament having a pair of parallel portions extending, respectively, through'said chambers; Y

2v. An electron discharge `device,,including a base, an evacuated vessel carriedy by said base, a cathode supported by thevbase and having a double thickness relatively ilat con-l necting portion and a pair ofy open-ended tubes, one at each end of the connecting por-.

tion, and a iilamenthavinga pair of para-l'- vso lel portions extending through said tubes and supported from said base.

3. An electron discharge A a base, an evacuated vessel carried .by said base, a cathode comprising a pair ofparallelV tubular metallic chambers anda connecting portion of double thickness between said tubular chambers and of the same length as the latter, a substantially U-shaped iilament of which the branches extendthroiigh and are encased within'said tubular chambers ,and

have their terminals Vmounted' inthe base,-

heat-resisting electrical. inc and a cover of p sulating material iitted in the upper end of each of said chambers andsurrounding the adj acent'portion of theV iilainenttherein. f

4. An electron discharge Adevice-having ai base, a lament in loop form having its terminals mountedy in the" baSefastand'ard mounted in thefbase, an insulator member carried-by the free end oftlier'standard and encasing the connecting portionfof the loopV of the filament, and a two chambered :cathode carried by the base and vhaving thefparallel portions of the loop extending throughsaid chambers with the insulator member above the cathode. t

In testimony whereof we have hereunto lset*VV our hands. A

SALVATORE SCOGNAMILLQ PAUL ARND'F. 'f 'v contour of the cathode 20,'the plate 31 being device, including 

